#define _CRT_SECURE_NO_WARNINGS 1
#include<stdio.h>
#include<assert.h>

int my_strlen(char* p1)
{
	assert(p1);
	char* p2 = p1;
	while (*p2)
	{
		p2++;
	}
	return p2 - p1;
}



int main()
{
	char arr[] = "abcdFFef";
 	int ret = my_strlen(arr);
	printf("%d", ret);
	

	return 0;
}